I have recently been playing under my old name Bob Saget because Wbn wont let me login to my other account..

Does this have anything to do with having the same password or email? Like are you only allowed one account under a certain email or something? Idk im just confused.. I spose If it comes down to it I can just keep using this one.. just thought it was weird that I cannot for the life of me login as my old account...